It was hypothesised that whole barley would lower caecal pH more thatn whole barley fed in combination with Betfor®. Four geldings were fed two concentrate diets: 2.06 kg whole barley + 300 g DM Befor® (BB) and 2.06 kg whole barley (B). Timothy hay was fed as roughages in both diets. A pH electrode was inserted through a caecal cannula and pH was recorded. There was an overall tendency (P=0.07) to a dietary effect of Befor® in terms of maintaining a more favourable caecal pH. Therefore, in conclusion, adding Betfor® to a whole barley meal prevented a drop in post-prandial caecal pH.